Mophie to double iPhone 4 battery life with $100 Juice Pack Plus

If your iPhone 4 is used mainly for making calls and sending text messages, it probably easily makes it through the day with some charge left in the battery. But if you spend your commute and breaks playing apps, watching video, or surfing the web, it may be dead by the time you get home.

Mophie believes it has a solution that promises to double the battery life of your iPhone 4. The only downside is your smartphone is going to get a bit fatter.

The case-with-battery offered by Mophie is called the Juice Pack Plus. It houses a 2000mAh capacity battery inside a dual-injected hard shell case and rubberized band around the edge, meaning you get some protection as well as hours more battery.

Mophie state the Juice Pack Plus allows:

Up to 8 additional hours talk time on 3G; 16 hours 2G

Up to 7 additional hours Internet on 3G; 11 hours WiFi

Up to 44 additional hrs audio playback

Up to 11 additional hrs video playback

Some other clever features include a standby/charging switch so you only use the extra juice when you need it. Charging and syncing can be done without having to remove your iPhone from the Pack, and there’s a status indicator on the bottom of the Pack telling you how much juice is left and what the charging status is.

If you’re concerned about how much bigger this will make your iPhone 4, and how much heavier, it’s not that bad. The iPhone has the following dimensions and weight:

Height: 115.2 mm

Width: 58.6 mm

Depth: 9.3 mm

Weight: 137 grams

The Mophie Juice Pack Plus is:

Height: 128.8 mm

Width: 63.8 mm

Depth: 17.3 mm

Weight: 71 grams (taking the total weight with iPhone to 208 grams)

The one shock comes with the price as the Juice Pack Plus costs $99.95. But for a doubling of your iPhone 4 battery life combined with a protective case it might be worth the investment.